`spack list`: add `--namesapce` / `--repo` option (#41948)

This adds options to `spack list` that allow you to list only packages from specific
repositories/namespaces, e.g.:

```console
spack list -r builtin
```

only lists packages from the `builtin` repo, while:

```console
spack list -r myrepo -r myrepo2
```

would list packages from `myrepo` and `myrepo2`, but not from `builtin`. Note that you
can use the same argument multiple times.

You can use either `-r` / `--repo` or `-N` / `--namespace`. `-N` is there to match the
corresponding option on `spack find`.

- [x] add `-r` / `--repo` / `-N` / `--namespace` argument
- [x] add test

2 files changed, 4 insertions, 2 deletions

diff --git a/share/spack/spack-completion.bash b/share/spack/spack-completion.bash
index 6193982774..1cad9c3da9 100755
--- a/share/spack/spack-completion.bash
+++ b/share/spack/spack-completion.bash
@@ -1320,7 +1320,7 @@ _spack_license_update_copyright_year() {
 _spack_list() {
     if $list_options
     then
-        SPACK_COMPREPLY="-h --help -d --search-description --format -v --virtuals -t --tag --count --update"
+        SPACK_COMPREPLY="-h --help -r --repo -N --namespace -d --search-description --format -v --virtuals -t --tag --count --update"
     else
         _all_packages
     fi
diff --git a/share/spack/spack-completion.fish b/share/spack/spack-completion.fish
index 31aba0aa7d..2cd66977d1 100755
--- a/share/spack/spack-completion.fish
+++ b/share/spack/spack-completion.fish
@@ -2017,10 +2017,12 @@ complete -c spack -n '__fish_spack_using_command license update-copyright-year'
 complete -c spack -n '__fish_spack_using_command license update-copyright-year' -s h -l help -d 'show this help message and exit'
 
 # spack list
-set -g __fish_spack_optspecs_spack_list h/help d/search-description format= v/virtuals t/tag= count update=
+set -g __fish_spack_optspecs_spack_list h/help r/repo= d/search-description format= v/virtuals t/tag= count update=
 complete -c spack -n '__fish_spack_using_command_pos_remainder 0 list' -f -a '(__fish_spack_packages)'
 complete -c spack -n '__fish_spack_using_command list' -s h -l help -f -a help
 complete -c spack -n '__fish_spack_using_command list' -s h -l help -d 'show this help message and exit'
+complete -c spack -n '__fish_spack_using_command list' -s r -l repo -s N -l namespace -r -f -a repos
+complete -c spack -n '__fish_spack_using_command list' -s r -l repo -s N -l namespace -r -d 'only list packages from the specified repo/namespace'
 complete -c spack -n '__fish_spack_using_command list' -s d -l search-description -f -a search_description
 complete -c spack -n '__fish_spack_using_command list' -s d -l search-description -d 'filtering will also search the description for a match'
 complete -c spack -n '__fish_spack_using_command list' -l format -r -f -a 'name_only version_json html'